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The objective of this is to improve performance by allocating larger >> chunks of memory during anonymous page faults. See [1] for background. > > Thanks for the quick response! > >> I've significantly reworked and simplified the patch set based on comments from >> Yu Zhao (thanks for all your feedback!). I've also renamed the feature to >> VARIABLE_THP, on Yu's advice. >> >> The last patch is for arm64 to explicitly override the default >> arch_wants_pte_order() and is intended as an example. If this series is accepted >> I suggest taking the first 4 patches through the mm tree and the arm64 change >> could be handled through the arm64 tree separately. Neither has any build >> dependency on the other. >> >> The one area where I haven't followed Yu's advice is in the determination of the >> size of folio to use. It was suggested that I have a single preferred large >> order, and if it doesn't fit in the VMA (due to exceeding VMA bounds, or there >> being existing overlapping populated PTEs, etc) then fallback immediately to >> order-0. It turned out that this approach caused a performance regression in the >> Speedometer benchmark. > > I suppose it's regression against the v1, not the unpatched kernel. >From the performance data Ryan shared, it's against unpatched kernel: Speedometer 2.0: | kernel | runs_per_min | |:-------------------------------|---------------:| | baseline-4k | 0.0% | | anonfolio-lkml-v1 | 0.7% | | anonfolio-lkml-v2-simple-order | -0.9% | | anonfolio-lkml-v2 | 0.5% | What if we use 32K or 16K instead of 64K as default anonymous folio size? I suspect this app may have 32K or 16K anon folio as sweet spot. Regards Yin, Fengwei > >> With my v1 patch, there were significant quantities of >> memory which could not be placed in the 64K bucket and were instead being >> allocated for the 32K and 16K buckets. With the proposed simplification, that >> memory ended up using the 4K bucket, so page faults increased by 2.75x compared >> to the v1 patch (although due to the 64K bucket, this number is still a bit >> lower than the baseline). So instead, I continue to calculate a folio order that >> is somewhere between the preferred order and 0. (See below for more details). > > I suppose the benchmark wasn't running under memory pressure, which is > uncommon for client devices. It could be easier the other way around: > using 32/16KB shows regression whereas order-0 shows better > performance under memory pressure. > > I'm not sure we should use v1 as the baseline. Unpatched kernel sounds > more reasonable at this point. If 32/16KB is proven to be better in > most scenarios including under memory pressure, we can reintroduce > that policy. I highly doubt this is the case: we tried 16KB base page > size on client devices, and overall, the regressions outweighs the > benefits. > >> The patches are based on top of v6.4 plus Matthew Wilcox's set_ptes() series >> [2], which is a hard dependency. I have a branch at [3]. > > It's not clear to me why [2] is a hard dependency. > > It seems to me we are getting close and I was hoping we could get into > mm-unstable soon without depending on other series... > From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 63454EB64D9 for ; Tue, 4 Jul 2023 06:23:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:In-Reply-To:From: References:CC:To:Subject:Date:Message-ID:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; 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